What are Surface Finish Spacing parameters?
| Surface Finish Parameters |
Symbols |
| Spacing parameters |
RSm, WSm, PSm
RHSC
RPc |
RSm, WSm, PSm
RSm is the mean spacing between profile elements at the mean line, measured within the sampling length.
R
sm = 1/n ∑
i=ni=1 S
i=[S
1+S
2+S
3+ ------ +S
n] / n
Where n = number of peak spacings. WSm and PSm are the corresponding parameters from the waviness and primary profiles, respectively.
RHSCS
RHSC The high spot count is the number of complete profile peaks (within a sampling length) projecting above the mean line, or a line parallel with the mean line.
RPc
RPc (peak count) and is the number of peaks per unit distance that project through a selectable band centred about the mean line.
RP
c= [Number of counts) / Assessment length (cm)] = Peasks / cm
In accordance with Amd 1, RPc is now calculated as
RP
c= L / RS
m
where L is the reference length (e.g. 1 cm or 1 inch).